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From "Alan Gates (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-1399) Logical Optimizer: Expression optimizor rule
Date Mon, 30 Aug 2010 21:38:54 GMT

    [ https://issues.apache.org/jira/browse/PIG-1399?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12904356#action_12904356
] 

Alan Gates commented on PIG-1399:
---------------------------------


{code}
     [exec]
     [exec] -1 overall.
     [exec]
     [exec]     +1 @author.  The patch does not contain any @author tags.
     [exec]
     [exec]     +1 tests included.  The patch appears to include 6 new or modified tests.
     [exec]
     [exec]     +1 javadoc.  The javadoc tool did not generate any warning messages.
     [exec]
     [exec]     +1 javac.  The applied patch does not increase the total number of javac compiler
warnings.
     [exec]
     [exec]     -1 findbugs.  The patch appears to introduce 2 new Findbugs warnings.
{code}

I'll attach the results of findbugs separately.

> Logical Optimizer: Expression optimizor rule
> --------------------------------------------
>
>                 Key: PIG-1399
>                 URL: https://issues.apache.org/jira/browse/PIG-1399
>             Project: Pig
>          Issue Type: Sub-task
>          Components: impl
>    Affects Versions: 0.7.0
>            Reporter: Daniel Dai
>            Assignee: Yan Zhou
>             Fix For: 0.8.0
>
>         Attachments: PIG-1399.patch, PIG-1399.patch, PIG-1399.patch, PIG-1399.patch,
PIG-1399.patch, PIG-1399.patch
>
>
> We can optimize expression in several ways:
> 1. Constant pre-calculation
> Example:
> B = filter A by a0 > 5+7;
> => B = filter A by a0 > 12;
> 2. Boolean expression optimization
> Example:
> B = filter A by not (not(a0>5) or a>10);
> => B = filter A by a0>5 and a<=10;

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